Yeah I'm another one who ignores C'thun due to reasons (also having seen the pictures of kungen pushing the stomach debuff off and just sitting around in there), I'd say yogg0. Out of the poll options I chose rag hc because a)I never personally saw vizier hc, so I don't feel as informed and b) vizier seems fairly RNG. IF spirit kings was a little harder pre-"fix" would we call him the hardest too? XDDD

@Kunkka kael was also fixed, as was vashj as I recall. Like Cthun they got killed immediately after. Not taking away from their difficulty, it just wasn't the reason they stood so long.

Lich King heroic 25 was tuned so damned well... 1 guild in the world got him before the 10 percent buff. Lich king 10 was a broken encounter... prolly the hardest they ever came up with. He was speculated to be unkillable in strictly 10 man gear until typhoon struggle got him, and that was with the 25% buff towards the end of wrath when people were starting to get bored.

Let me elaborate.... Inn WOTLK and Cataclysme players was much much more exsperienced than older times. Not that top guilds was playing badly inn TBC or vanilla, but truely HC LK was insane with its limited attempts, and HC Ragnaros being killed after like 800 pull's.

And LK 25 was only beaten at 5% nerf, but I also don't recall him being fixed as well.

Not many people caught this, but he was actually buffed after the world first Heroic Sindragosa which was on 10m by some Russian guild IIRC. Paragon did go back and kill the 25M version with the buff turned off months later but their gear was much better, they had been farming him for months.